Locomotive brake equipment



I M y 1953 l. M. EISENBERG 2,537,602

7 LOCOMOTIVE BRAKE EQUIPMENT Filed Sept. 7, 1949 2 SHEETS-SHEET 1 90 61 I 57 54 flg'fi 59 5 176 aoezLas 75 ,6 o//55 9 INVENTOIIC.

Irwin M Eisen berg .BY

ATTORNE {I y 5, 1953 l. M. EISENBERG 2,637,602

LOCOMOTIVE BRAKE EQUIPMENT Filed Sept.- '7, 1949 2 SHEETS-SHEET 2 INVENTOR. Irwin M Eisenbezy BY ATTORNEY Patented May 5, 1953 proved STATES arent @litldh 2,637,602 LOCOMOTIVE BRAKE EQUIPMENT Erwin M. Eisenberg, Stewartsville, Irwin, Pa, as-

signor to Westinghouse Air'Brake Company, a corporation of Pennsylvania Application September '7, 1949, Serial No. 114,362

16 Claims. i

This invention relates to oralre apparatus and more particularly to the type for use on locomo tives of the electrically propelled type.

Certain locomotives or" the diesel electric type are equipped with Westinghouse Air Brake Cornpanys No. locomotive brake equipment for controlling braking of the locomotive pneumatically, and the electric propulsion motors are arto operate as generators for Supplying electric current to a brake resistor for providing electric braking.

The No. 8EL locomotive brake equipment comprises a distributing valve device and an engineers brake valve device'consisting of an auto-- matic portion and an independent portion. The automatic portion. is provided for reducing pressure of fluid in the usual brake pipe to cause operation of the distributing valve device on the locomotive and of the triple valves or the like on cars of a train for effecting an automatic application of the fluid pressure brakes thereon. independent portion of the engineers brake valve device is provided for effecting operation of a portion of the distributing valve device to apply and releas the fluid pressure brakes on the locomotive independently of the brakes on train. If both the fluid pressure and electric brakes on the locomotive are effective at the same slipping and undesired Wear of the locomotive wheels may occur, but under certain conditions it is desirable to be able to apply the fluid essure on the locomotive when the electric brakes are effective.

The principal object of the invention is therefore the provision of an improved locomotive brak equipment embodying-both fluid pressure electric braking means and interlock means automatically operative when the electricjbraking means is effective to prevent an automatic ap plication of the fluid pressure brakes on the locomotive, but which will permit control of the fluid pressure brakes on the locomotive by operation of the indepc dent portion of the engineers brake valve device when the electric brakes are efi'ective.

Other objects and advantages will become ap-v matic views of a portion of an independent brake valve device shown in Fig, 1, but with the rotary valve thereof shown in diilerent positions; Fig. 4 is a diagrammatic view of a part of the equalizing portion of the distributing device shown in Fig. l but with the slide valves and piston in a different position; and Fig. 5 is a diagrammatic view, similar to a portion of Fig. 1a, but showing a different use of the invention.

Description 0 f ports As shown in the drawing, the fluid pressure brake equipment for the locomotive comprises a distributing valve device i, an engineers brake valve device comprising an automatic brake valve device 2 and an independent brake valve device 3, a main reservoir i, and a brake cylinder device 5. The fluid pressure brake equipment further comprises a brakepipe ii, a main reservoir pipe fl, independent application and release pipes 8 and 9, respectively, and a controlled emergency pipe it).

The electric brake apparatus for the locomotive may, in a simple illustrative form, comprise a propulsion motor ll adapted to be operated as a generator for supplying electric current to a dynamic bra-king resistor l2 for providing a decelerating force for braking purposes. erence numeral l3 designates an engineers controller which may have a power-on position and a dynamic brake-on position, as indicated in the drawing by suitable legends. the power- 0h position a contact i l in the controller is adapted to bridge a pair of contacts it it for completing a' circuit for supplying electric current to the motor H, such circuit being by way of example, from a wire hi, supplied. with current from a suitable source such as generator (not shown) the contact id, the conductor 29, motor ii and a grounded conductor 2 l. In the dynamic'brakeon position a contact 252 is adapted to bridge contacts IS and 23 for placing motor 5 i in a dynamic braking circuit including resistor which is effective to produce dynamic hr ing upon operation of motor 6 as a generator in a well-known manner.

The distributing valve device l comprises an equalizing portion an application portion 2%, a reduction chamber cut-oil valve device a release valve device it and a safety valve device 29 all of which parts are carried a pipe bracket 30 in which there is provided a reduction chamber 3!. Also carried by the pipe bracket Sills a controlled emergency or delay valve device 32. The pipe brackettil is in turn carried cy a reser- The ref voir portion in which there are provided a pressure chamber 33 and an application chamber 34.

The distributing valve device I, the engineers brake valve device including the automatic brake valve device 2 and the independent brake valve device 3 and other parts of the pneumatic brake equipment are, with an exception which will hereinafter be particularly pointed out, substantially the same in construction and operation as the Westinghouse Air Brake Companys No. 8EL locomotive brake equipment fully disclosed in their instruction pamphlet No. 5032-1, Sup. 3, dated November 1943 and also substantially the same in operation as the locomotive brake equipment fully disclosed in Patent No. 2,009,841, issued to Ellis E. Hewitt on July 30, 1935. Only such portions of the locomotive fluid pressure brake equipment are therefore disclosed in the drawing and only the portions of operation of said equipment which are essential to an understanding of the improvement provided by this invention will therefore hereinafter be described.

The application portion 23 of the distributing valve device comprises an application piston 35, a baffle piston 35 spaced from and connected to said application piston, and an operating stem 31 projecting from said bafile piston into a valve chamber 38 which is connected by a passage 39 and a pipe 48 to the brake cylinder device 5. At one side of the application piston 35 is a control or application piston chamber 4|, commonly known as the application cylinder, which is connected by a passage 42 extending through the pipe bracket 38 to the controlled emergency valve device 32. Between the application piston 35 and baffle piston 35 is a chamber 43 which is open through a stabilizing choke 44 to the brake cylinder passage 39. A brake cylinder release valve 45 contained in valve chamber 38 is loosely mounted between two spaced shoulders 45 on the piston stem 31 for movement by the application piston 35. The valve 45 is provided for controlling communication between chamber 38, and thereby the brake cylinder device 5, and an atmospheric port 41. tion of the distributing valve device further comprises a fluid pressure supply valve 48 contained in a chamber 49 which is connected by a passage 59 to a pipe connected to the main reservoir pipe l, whereby said chamber is adapted to be constantly supplied with fluid under pressure from the main reservoir 4. A seat 52 is arranged to be engaged by the supply valve 48 for closing communication between chamber 49 and the valve chamber 38. A spring 53 acts on the supply valve 48 for urging it into contact with the seat 52. The supply valve 48 is arranged in coaxial relation with the application piston stem 31 so that upon movement of the piston 35 and said stem in the direction of the right hand, said stem will pass through the opening encircled by the valve seat 52 and engage and then unseat said valve against spring 53.

When the application piston chamber 4| is open to atmosphere, the parts of the application valve device 26 will assume a position in which the supply valve 48 is seated and the release valve 45 is opening communication between the valve chamber 38 and the atmospheric port 4'! for thereby effecting a relase of fluid under pressure from the brake cylinder device 5 and a release of locomotive brakes. Upon supply of fluid under pressure through passage 42 to the application piston chamber 4| the application piston 35 will move in the direction of the right hand and The application por- 4 after a certain degree of such movement the left hand shoulder 46 will engage the release valve 35. Further movement of the application piston 3; will then shift the release valve 45 to a position for closing communication between valve chamber 38 and the atmospheric port 41. Still further movement of the application piston by pressure of fluid in chamber 4| will bring stem 31 into engagement'with the supply valve 48 and then open said valve against the pressure of spring 53 whereupon fluid under pressure from the main reservoir 4 present in chamber 49 will flow to valve chamber 38 and thence through passage 39 and pipe to the brake cylinder device 5 for effecting an application of locomotive brakes. Fluid under pressure thus supplied to the brake cylinder device 5 by way of passage 39 will also flow from said passage through choke 44 into chamber 43 and therein act on the application piston 35 in opposition to the pressure of fluid in the control chamber 4|, the pressure of fluid in said control" chamber being also opposed by the pressure of fluid in valve chamber 38 acting on the bafile piston 36. When the pressure of opposing fluid in chambers 38 and 43 increases to a degree.

slightly in excess of the control pressure in chamber 4|, the application piston 35, baffle piston 36 and thereby stem 31 will be moved in the direction of the left hand relative to the ex lhaust valve 45, due to the lost motion connection between the said valve and the two shoulders 46, until the right hand shoulder 46 engages said valve. This moveinent'of the application 'piston 35 will permit closing of the supply valve 48 by spring 53 to prevent iuither flow of fluid'under' pressure to the brake cylinder device 5, for there-- by limiting the increase in pressure therein and in valve chamber 38 and in chamber 43 to a degree substantially equal to that in the application piston chamber 4|, and whereupon, with the right hand shoulder 46 in contact with the release valve movement of piston 35 will cease in what is known as a lap position. If the pressure of fluid in the application piston chamber 36 through passage 42 the greater pressure then present in chambers 43 and 38 will move piston 35 and the exhaust slide valve 45 back to release position, in which they are shown in the drawing, for opening chamber 38 to the exhaust port 4'! whereupon fluid under pressure will be .released from the brake cylinder device 5 to effect a release of the locomotive brakes.

The equalizing portion 25 of the distributing 'valve device is provided for operation in response to a reduction in pressure of fluid in.

"brake pipe 9 to supply fluid under pressure from the pressure chamber 33, which is normally sup- ;plied with fluid under pressure, to passage 42 leading to the application piston chamber 4|, land for releasing fluid under pressure from said chamber 4| in response to an increase inpressure of fluid in said brake pipe.

To this end the equalizing portion 25 comprises a piston 54 at one side of which is a chamber 55 open to the brake pipe 6 by way of a pas- .sage 56 extending through the pipe bracket 30. .At the opposite side of piston 52 is a valve cham- 'ber 51 open through a passage 58 to the pressure chamber 33. The valve chamber 51 contains a "main slide valve 59 loosely mounted between two spaced shoulders 60 on a stem 6| projecting from the equalizin piston 54. Mounted to slide on ;.the main slide valve 59 is an auxiliary slide valve is reduced by releasing it 92 which is disposed in arecess in the piston stem 6! for movement therewith. I

The reduction chamber cut-off valve device 21 comprises a piston 64 at one side of which is a chamber 55 open through a passage 96 to the seat of the main equalizing slide valve 59. At the opposite side of piston 94 is a valve chamber 6! containing a slide valve fit connected for movement with the piston 64. The piston 69 and slide valve 68 have a normal position in' which they are shown in the drawing and cut-01'1" position defined by engagement between said piston and a gasket 69. Two passages 19 and H connect the valve chamber 61 to the seat of the main equalizingslide valve 59, the passage 10 being open to said chamber and the passage H being closed from said chamber by said slide valve when in its normal position shown in Fig; la, while passage II is open to said chamber and passage 10 is closed from said chamber by said slide valve when in its cut-off position.

The engineers automatic brake valve device 2 is provided for varying the pressure of fluid in the brake pipe 6 and thereby equalizing piston chamber 55 of the distributing valve device I for controlling operation thereof to effect application and release of the locomotive brakes in the usual well-known manner. When the brake pipe 6 and thereby the equalizing piston chamber 95 are charged with fluid at normal pressure the equalizing piston 54 and connected slide valves 59 and 62 will assume their usual release position in which both passages 95 and H will be open to a port 12 in the main slide valve 59 and thence to a cavity 13 in said valve whereby the opposing c fluid pressures on the reduction chamber cut=oii valve piston 64 will be equalized to permit a spring M to move the piston 54 and slide valve as to their normal position for opening a passage 15, connected to cavity 13 in the equalizing slide valve 59 in its release position, to a passage 15 and thence by way of a normal release choke 11 to a passage 18 in the pipe bracket 39 which latter passage is connected to the independent appli cation pipe 8. The application chamber 34 is open by way of a passage 19 to cavity 13 in the main equalizing slide valve 59 in its release position and the application piston chamber 4| is also adapted to be opened to passage 15 and thence cavity 13 in a manner which will be later described, when the main equalizing slide valve 69 is in its release position for thereby releasing fluid under pressure from said chambers under such a condition and in a manner which will be later brought out.

In response to a service reduction in pressure efiect'ed in brake pipe 6 and thereby in the equalizmg piston chamber 55 by operation of the automatic brake valve device 2, the equalizing piston 54 and slide valves 52 and 59 will move to their usual service position in which these parts are shown in Figs 5 of the drawing. In service position of the main slide valve 59 the reduction cutoff valve piston chamber 65 is "open to atmosphere through passage 66, a port I15 in said slide valve and an atmospheric passage I'ILwhile a service port 89 is uncovered by the auxiliary slide valve 62 and registers with a passage '81 leading to the seat of slide valve 68 in the reduction chamber cut-off valve device 21. With the slide valve 69 in its normal position a cavity 82 therein opens passage 81 to a-passage '83 whereby 'fiuid'su'pplied from the pressure chamber 33 through service port 89 to the former passage and thence to the latter passage will now to the reduction chamber 3| by way of the latter passage which is also com nected to the seat of the main slide valve 59' and thence through a cavity 83a therein to passage 19 leading to the chamber 61 in the reduction cut-oil valve device 21. When the pressure or fluid in chamber Bl and reduction chamber 3| is then increased by flow 'from the pressure chamber 33 sufficiently to overcome the opposing force of spring 14 on piston 64 (the chamber 65 being vented) said piston will move to its left hand or cut-ofi position for closing communication between passages 8| and 93 and for opening passage ill to passage 15 whereby further flow of fluid from the pressure chamber 93 will be to the latter passage for supply to the application piston chamber M to effect a service application of the locomotive brakes in a manner which will be more fully described later.

In response to an emergency reduction in pressure in brake pipe 6 eiiected by the automatic brake valve device 2 the equalizing piston 54 will move the slide valves 62 and 59 to its extreme right-hand or emergency position and in this position a port 84 in the main slide valve 59 open to the equalizing valve chamber 51 without control by the auxiliary slide valve 62 will establish communication between the pressure chamber 33 and passage 8| for supplying fluid under pressure to the application piston chamber M for effecting an emergency application of brakes.

It is to be noted that passage 79 from the application chamber 34 is open by way of cavity 13 in the main slide valve 59 to passages 15 in service position of said main slide valve so that fluid will be supplied to said chamber from the pressure chamber 33 in eiiecting a service application of brakes, but in emergency position of said main slide valve the passage 19 will be lapped by a portion 85 of said main slide valve to prevent flow of fluid from the pressure chamber 39 by way of said main slide valve to the application chamber 34.

The release valve device 29 comprises a check valve til contained in a chamber 98 open to passage 15 and normally urged to a closed position by a spring as. The check valve 911 is provided for closing communication between chamber 88 and a chamber 99 which latter chamber is open through a passage at to passage "F8 in the bracket 39 leading to the independent application pipe 9, said check valve thereby controlling a communication from passage 15 to passage l8 b'y-passing the normal release choke El and of greater flow capacity than said choke. The release valve device 29 further comprises a piston 92 at one side of which is an atmospheric chamber 93 While at the opposite side is a chamber 9t connected by a passage 95 to the independent release pipe 9 extend ing to the independent brake valve device 3. A stem 96 projects from piston 92 to engage and unseat the check valve 9! upon movement of piston 92 in response to supply of fluid under pressure to chamber 94.

The safety valve device 29 is open through a passage 97 to the seat or the main equalizing slide Valve 59. In service position of the slide valve 59 a port 98 therein is adapted to connect passageel to a cavity 99 in the auxiliary slide valve 62 and thence by way of port 52 in main slide valve to cavity i3 and thereby to th application chamber 3 and-application piston chamber 4i, while in emergency position of said main slide valve passage 97 is adapted to be opened to port 84 in said slide valve and thereby to the pressure chamber 33 and connected application piston chamber 4I, for thereby limiting to a chosen safe degree pressure of fluid obtained in said piston chamber and thereby the degree of brake application on the locomotive under such conditions.

It will now be seen that in both the service and emergency positions of the equalizing piston 54 and slide valves 59 and 62 fluid under pressure is permitted to flow from the pressure chamber 33 to passage I5 and to the safety valve device 29, While the application chamber 34 is connected to passage I5 in service position but not in emergency position of said slide valves.

The passage I5 just mentioned, the passage 42 from the application piston chamber 4!, passage I9 from the application chamber 34, the main reservoir, passage 50 and a pipe I connected to pipe bracket 30 are all connected to a mounting face 99 on said pipe bracket for, heretofore, registry with aligned passages, bearin the same reference numerals, in the controlled emergency valve device 32. Interposed between the controlled emergency valve device 32 and the mounting face 99 on the pipe bracket 30 is however a filler piece IOI constituting a part of the present invention.

The controlled emergency valve device 32 comprises a piston I02 at one side of which is a chamber I03 and at the opposite side of which is a valve chamber I04 containing a slide valve I05 arranged to be moved by said piston to two different positions, namely, a position for short freight train or passenger train operation, in which these parts as shown in the drawing, and a position for long train operation in which the piston and slide valve will be moved down until said piston contacts a shoulder I06 in the casing.

The valve chamber I04 is adapted to be constantly supplied with fluid under pressure from the main reservoir pipe and passage 50 by way of a passage I01 extending through the filler piece IOI. Chamber I 03 at the opposite side of piston I02 is adapted to be either charged with fluid under pressure or to be open to atmosphere by way of a passage I08 extending through the filler piece IOI and connecting said chamber to pipe I00. When the chamber I03 is open to atmosphere, in a manner which will be later described, the piston I02 and slide valve I05 Will assume their short train position under pressure of fluid effective in valve chamber I04, while upon supply of fluid under pressure to chamber I03 a spring I09 therein will move the piston I02 and slide valve I05 to their lower or long train position.

In addition to the passages I08 and I0I extending through the filler piece IOI for connecting aligned passages in bracket 30 and the controlled emergency valve device 32, said filler piece also has through passages IIO and III connectmg respectively, passages I9 and 42 in the bracket to aligned and correspondingly numbered passages in valve device 32. Th filler piece IOI has an opening for connecting passage I08 to the outer surface of the filler piece which opening is closed by a plug H2 in the structure shown in Fig. 1A. At the end of passage I08 against the pipe bracket 30 is a cavity II3 adapted to receive plug I I 2 upon removal from the location in which it is shown in Fig. 1A under a condition to be later brought out. With the plug I I2 positioned as shown in Fig. 1A, it will be seen that passage I08 connects piston chamber I 03 to pipe I00 as above described.

The filler piece [0! also has a passage I I4 connecting passage I5 in the bracket to an external pipe I I5. Still further, the filler piece IOI has a passage I I6 connecting an external pipe II! to passage I5 in the controlled emergency valve device 32. A branch of passage II 6 containing a choke IIIa connects passage II6 to passage 42 in the controlled emergency valve device.

The slide valve I05 of the controlled emergency valve device has a cavity I I8 for establishing communication between passages I5 and 42 therein, by-passing the choke I I'Ia, in the short train position of said valve. In the long train position of the valve I 05 the communication just described is closed and a cavity II9 connects passages 42 and 19 in the controlled emergency valve device, which connection is closed in the short train position of said valve.

It will thus be seen that in the short train position of the control emergency valve device 32 the application piston chamber 41 is opened around the choke IIIa to pipe Ill, and passage IIO from the application chamber 34 is disconnected from said piston chamber, while in the long train position of said valve device communication between passage I I6 and the application chamber 34 and application piston chamber H is through choke IIIa.

From the above description it will be noted that interposing the filler piece IOI between the controlled emergency valve device 32 and pipe bracket 30 merely intercepts the connection between passage I5 in said bracket and passages I5 and 42 in said valve device and provides a means for connecting said passages I5 to the external pipes I I5 and I I! as above described, the filler piece further providing the recess I I0 and other recess in which the plug I I2 is disposed for reasons which will be later brought out.

The pipe III leads to the side outlet of a double check valve device I2I the opposite ends of which are open to the independent application pipe 8 and to a pipe I22, respectively. The double check valve device I2I comprises a double check valve I23 adapted to operate in response to supply of fluid under pressure to the independent application pipe 8 to open communication between said pipe and pipe ill and to close off the latter pipe from pipe I22 at a time when pipe I22 is vented. A bias spring I24 acting on the double check valve I23 is provided for actuating said check valve to the position in which it is shown in the drawing for closing communication between pipes 8 and Ill and for opening the latter pipe to pipe I22 when pipe 8 is vented.

The pipes I22 and H5 lead to a magnet valve device I25 adapted to be energized when the dynamic brakes on the locomotive are effective and deenergized at other times and to this end said magnet valve device is shown in the drawing, for illustrative purposes, connected in series llogtween wire 2I and the dynamic brake resistor The magnet valve device I25 comprises two valves I26, I2! contained in a chamber I28 to which pipe I22 is open. The valve I25 is provided for controlling communication between chamber I28 and a chamber I29 which is open to atmosphere through a port I30. The valve I21 is provided for controlling communication between chamber I28 and a. chamber I3I to which pipe H5 is connected. When the magnet of the magnet valve device I25 is energized the valve I26 is adapted to be open and the valve I2! closed, and when said magnet is deenergized a spring is adapted to open valve I21 and close valve For preventing operation of the dynamic brakes on the locomotive at a time when an emergency application of the fluid pressure brakes is-efiective in response to an emergency reduction in pressure of fluid in the brake pipe 6- efiected by operation of the automatic brake valve device 2, or otherwise, a pneumatic switch I34 is provided. This switch comprises a contact element I35 for opening and closing the dynamic brake circuit, as between the wire 2I and the resistor 52. The

contact I35 is connected to a piston I36 at one I38 will actuate the piston I36 and'thereby the switch I35 to a position for opening the dynamic brake circuit.

Pipe Hill from piston chamber I33 in the controlled emergency valve device as leads to a valve chamber Hit in a relay valve device M2. A valve I43 contained in chamber Hi0 controls communication between said chamber and a chamber I44 which is open to atmosphere through a passage I45. The valve It'd is provided on one end of a stem I46 extending through a chamber MA and connecting said valve to a plunger M? which is slidably mounted in a suitable bore in the casing. On the end of plunger I l! opposite valve I43 is a valve seat encircling an axial passage I48 and provided for contact by a valve we contained in a chamber Itll. The passage I 38 extends through the plunger I 41, valve stem I 46 and valve I43 and is constantly open to chamber I40, the valve Itil bein provided for controlling communication between said chamber and the chamber Ifii The chamber I55! is open to the controlled emergency pipe II) to which is connected close to the valve device H12 a volume reservoir MI. The valve its is connected to one end of a stem I52 extending from chamber I through a suitable bore in the easing into the chamber I53 which is open to atmosphere through a port I54. The opposite end of the stem I52 is in the form of a follower I55 which engages one side of a diaphragm I55 at the opposite side of which there is a chamber I57 which is open to brake pipe Ii. A spring I58 in chamber I53 acts on the diaphragm I56 in opposition topressure of fluid in chamber I53 W hen chamber I5'I is charged with fluid under pressure from brake pipe 5 the diaphragm I56 will be deflected against spring I58 for seating valve M9 on plunger It! and for then actuating said plunger to open valve I43 for thereby opening chamber I03 in the controlled emergency valve device 32 to atmosphere by way of the atmospheric passage I45. When chamber I 5? is vented, as upon an emergency reduction in pressure in the brake pipe 6, spring I58 will deflect diaphragm I56 in the direction of chamber I 51 for thereby unseating the valve I49. Upon unseating of valve MS, a spring I58 contained in chamber ME! and acting on valve let will close said valve whereupon chamber Illfii in the controlled emergency valve device 32 will. be opened by way of chamber M4 to passage M8 and past the unseated valve 1 49 to the controlled emergency pipe It.

The independent brake valve device 3 comprises a rotary valve I62 contained in a chamber I53 which is normally charged with fluid under 10 pressure, as well known, and said valve is connected by a key Hi l to an operating handle 5&5. The'handle I65 and rotary valve IE2 have the usual running position in which these parts are shown in Fig. 1 of the drawing and said handle is operative to turn said rotary valve to the usual release position (Fig. 2) and to slow and fast application positions, the rotary valve E52 being shown in one of the appli=..ation positions in Fig. 3 of the drawing; The application pipe d and independent release pipe 9 are connected to the seat of rotary valve Hi2 and said rotary valve has a cavity 166 adapted in its running condition to open the application pipe 8 to a passage it? which, while not shown in the drawing, is open to atmosphere through the automatic brake valve device 2 in its running position, as well known. A cavity I8 3. in rotary valve I52 opens the independent release pipe 0 to an atmospheric port 269 in the running position of said rotary valve. In the appli ation position of rotary valv itii (Fig. 3) the independent release pipe 9 is open to atmospheric port by way of a cavity I'ifl in said rotary valve while the independent application pipe 8 is open through a port ill in rotary valve to the rotary valve chamber let whereby fluid under pressure will flow to said pipe. In the release position of rotary valve M2 (Fig. 2) the independent application pipe 8 i is open to the atmospheric port use by way of a cavity 1'32 in the rotary valve while the independent release pipe it is open through a port I13 in the rotary valve to the rotary valve chamber IE3 so as to receive fluid under pressure from sai chamber.

The controlled emergency pipe it leads to a selector valve in the independent brake valve device 3 which comprises a handle Ila having a short train position in which it is shown in the drawing for opening said pipe to atmosphere and having a long train position, designated by a dotted line N55, for supplying fluid under pressure to said pipe.

Operation In operation, let it be assumed that the dynamic brakes on the locomotive are ineffective, that the brake pipe 5 is charged with fluid under pressure by operation of the automatic brake valve device 2, that the independent brake valve handle its and rotary valve Hi2 are in their running position in which they are shown in Fig. l, and that the selector valve handle is in short train position venting the controlled emergency pipe It. With the controlled emergency pipe it vented, reservoir l5! and the chamber I59 in the relay valve device M2 will likewise be vented. With the brake pipe t charged with fluid. under pressure and chamber I5? in the relay valve device Hi2 likewise charged, the diaphragm i-ilfi will deflected to close valve MS and open valve I43 for thereby venting, by way of the latter valve, piston chamber H53 in the controlled emergency valve device associated with the distribntingvalve device. With chamber 1 cs vented fluid under pressure from the main reservoir ipe i acting in valve chamber its will hold the piston I92 and slide valve I95 in their non-controlling or short train position in which these parts are shown in the drawing.

With brake pipe ii charged the parts of the distributing valve device will assume their brake release position for charging the equalizing valve chamber El and the pressure chamber and for venting the application piston chamber II to atmosphere through passage 42, cavity I I8 and passage 15 in the controlled emergency slide valve I65, pipe II1, past the upper end of the double check valve I23, pipe I22, past the open valve I 21 in the magnet valve device I25, pipe I I5, passage 15 in the pipe bracket 30, cavity I16a in the reduction chamber cut-off slide valve 68, passage 16, the normal release choke 11, passage 16, the independent application pipe 8, cavity I66 in the rotary valve I62 of the independent brake valve device 3, and thence through passage I61 and the automatic brake valve device 2, with said brake valve devices in the usual running position as in Fig. 1. With the independent application pipe 8 vented as just mentioned, the double check valve I23 will assume the position for opening pipe I I1 to pipe I22 due to the pressure of spring I24, and thereby establish the communication just described, as will be evident.

. With the dynamic brakes released, if the engineer desires to effect an automatic service application of brakes on the locomotive, he will operate the automatic brake device 2 to effect a service reduction in pressure in the brake pipe 6 in response to which the equalizing portion 25 of the distributing valv device will move to service position for supplying fluid under pressure from pressure chamber 33 to the application chamber 34 and to passage 15 in the bracket 36 as above described. The fluid thus supplied to passage 15 will flow through pipe II5, past the open valve I21 in the magnet valve device I25, through pipe I22 and the double check valve device I2I to pipe H1, and thence through passage 15 in the controlled emergency valve device 32 and cavity H8 in slide valve I65 and passage 42 also in said device to passage 42 in the bracket 30 leading to the application piston chamber 4I. Fluid from the pressure chamber 33 is thus supplied to both the application chamber 34 and application piston chamber M and acting in the latter chamber will actuate the application portion 26 of the distributing valve device to effect a service application of brakes.

In case an emergency application of brakes is desired the engineer will operate the automatic brake valve device 2 to emergency position for effecting an emergency reduction in pressure in brake pipe 6. In response to such reduction the equalizing portion 25 of the distributingv valve device will move to emergency position for opening the pressure chamber only to passage 15 from which fluid under pressure will flow to the application piston chamber 4I through the same path as above described, but in this case, with the controlled emergency valve device 32 in short train position, no fluid under pressure will be supplied to the application chamber 34 and a maximum rate of increase and degree of pressure will be obtained in the application piston chamber 4I limited by the connected safety valve device 29.

If the selector valve handle I14 on the independent brake valve device 3 is in its long train position supplying fluid under pressure to the controlled emergency pipe I6 and thence to reservoir II and valve chamber I50 of the relay valve device I42, said relay valve device will be venting pipe I36 except upon an emergency reduction in brake pipe pressure, so that when a service application of brakes is effected as above described, the controlled emergency valve device 32 will remain in its short train position and fluid from the pressure chamber 33 will flow to both the application chamber34 and application piston chamber 4| for efiecting a service application of locomotive brakes in the same manner as above described. However upon an emergency reduction in brake pipe pressure, the relay valve device I42 will operate to open pipe I00 to the controlled emergency pipe in and charged reservoir I5I so that fluid under pressure from said reservoir will equalize into chamber III-'3 of the controlled emergency valve device 32 and permit spring I09 to move the parts of said device to their long train position. The fluid under pressure supplied from pressure chamber 33 to passage 15 in the bracket for supp-1y to the application piston chamber 4I will then have to flow through the controlled emergency choke Ii1a to said chamber and at the same time through cavity H9 in the controlled emergency slide valve I05 to passage 19 and the application chamber 34 whereby a relatively slow rate of build-up in pressure is obtained in the application piston chamber 42 and thereby a correspondingly slow rate of brake application is obtained on the locomotive to avoid harsh gathering of slack in a long train.

The reservoir I5I is employed to provide, close to the distributin valve device, a local volume of fluid under pressure to quickly provide the necessary pressure in chamber I63 of the controlled emergency valve device to effect movement thereof to its long train position upon an emergency reduction in brake pipe pressure, as just described.

In order to release either a service or an emergency application of brakes effected as above described, the automatic brake valve device 2 will be returned to its usual running position for recharging the brake pipe 5 and reopening the independent application pipe 8 to atmosphere. In response to the increase in brake pipe pressure, the equalizing portion 25 of the distributing valve device will return to its release position for recharging the pressure chamber 33, and for causing the reduction cut-01f valve device 21 to return to its normal position to open passage 15 to passage 16, whereupon the application piston chamber H and application chamber 24 will be vented via the path including the normal release' choke 11 hereinbefore described, for effecting a release of the locomotive brakes, the spring I24 insuring that the double check valve I23 will occupy the position shown in the drawing for opening said path of communication with the independent brake valve device in running osition for venting the independent application p'pe 8 subsequent to an automatic application of the fluid pressure brakes on the locomotive.

If theengineer desires to effect an application of brakes on the locomotive independent of the brake pipe 6, and hence independent of the brakes on a train, he will move the independent brake valve handle I65 to its application position (Fig. 3) for supplying fiuid under pressure to the independent application pipe 8. Fluid thus supplied to pipe 8, with pipe I22 vented via the distributing valve device I in its release position,

will shift the double check valve I23 to its upward position for opening pipe 8 to pipe II1 through which fluid will flow by way of cavity H8 in the controlled emergency valve device 32 to passage 42 in the bracket 30 and thence to the application piston chamber H for operating the application portion 26 of the distributing valve device to effect an application of brakes.

In order to release an application of brakes e fiectedb y operation of the independent brake 13 valve device as just described, the independent brake valve handle 1% may be returned to its runnin position (Fig. 1) whereupon the fluid will be released from the application piston chamber ll by reverse-flow through the pipes ill and t, as will be apparent.

If the equalizing portion of the distributing valve device is in either its service or emergency position effecting an application of locomotive brakes, such an application may be released,'if desired, by moving the operators independent brake valve handle N35 to its quick release position (Fig. 2) for supplying fluid under pressure to the independent release pipe ii and in which position the independent application pipe 23 is open to atmosphere. The pressure or" fluid thus supplied. to the independent release pipe Q will flow to chamber 95 in the release valve device it and operate piston 92 to open check valve ti whereupon fluid from the application piston chamber l! will be released through the bracket passage ill, the controlled emergency valve device 32, pipe Hi, past the upper end of the double check valve 123, which will be in its lower position when an automatic application of brakes is in effect, through the open valve l2l of the magnet valve device :25, pipe Elli, passage in the distributin valve device, past the open check valve to chamber 95 and thence through passages ill and if; to the independent application pipe 3 which is open to atmosphere through the independent brake valve device 3 at this time.

if a reapplication or" the brakes on the locomotive is desired with the equalizingportion of the distributing valve device still in its service position such reapplication may be effected by movement of the independent brake valve handle 65 to its application position 3) whereupon the brakes will be reapplied via the controlled emergency valve device 32 in the same manner as above described. If the controlled emergency valve device 32 should be in its long train position at this time, the application will occur through the controlled emergency choke ills in said device and at the same time via passages it, Eli, check valve chamber til, past check valve and thence through passage l5 and the controlled emergency valve device by passing said choke.

"v'Vith but one exception, which will be hereinafe described, the brakes on the locomotive can be controll d as just described with the improved brake equipment, including the filling piece It! and the relay valve device l t-l2, in the sanv'rnanner as with the l lo. SEL locomotive brake equipment.

Now let it be assumed that the locomotive is being braked by the dynamic brakes in which case the magnet or" the magnet valve device 2255 will be energized opening valve H29 and closing valve H27. If a service application of the fluid pressure brakes were effective at the time the dynamic brakes were rendered effective, such service application of brakes will be released past the open valve l2l5 in the magnet valve device [25, by virtue of release of fluid under pressure from the application piston chamber 5! through pipe ill, the double check valve device 12! and pipe 525-3 whereby both the dynamic and automatic fluid pressure brakes cannot be effective at the same time during normal braking of the train. When the dynamic brakes are effective if the pressure or" fluid in the brake pipe 6 is reduced for effecting a service application of the brakes, the distributing valve device will operate in the same manner as hereinbefore described to supply fluid under pressure to pipe H5 but with the valve 12'! in the magnet valve device l25 closed, fluid will be prevented from flowing from pipe M5 to pipe H1 and thereby an automatic application of the fluid pressure brakes on the locomotive will be prevented.

If, however, it becomes necessary to apply the fluid pressure brakes on the locomotive at the time the dynamic brakes are eflective this may be accomplished by movement of the independent brake valve device handle 465 to application position (Fig. 3) in which case fluid under pressure will be supplied to the independent application pipe 8 and thence through the double check valve device l 2 l to pipe H1 and to the application piston chamber M in the same manner as above described. :Such an independent application of the locomotive brakes, while the dynamic brakes are effective, may also be released when desired by returning the handle M5 to its normal running position or to its quick release position (Fig. 2) in which case the release will occur in the same manner as hereinbefore described.

Whenever an emergency reduction in pressure in brake pipe 5 is effected, the switch device we will operate to break the dynamic braking circuit to thereby either prevent the dynamic brakes becoming effective, or in case they are effective at the time to render them ineffective and the distributing valve device I will operate in the same manner as hereinbefore described to apply the brakes on the locomotive either at a fast or slow rate determined by the position of the selector valve handle Ht on the independent brake valve device 3, as hereinbefore "described.

As hereinbefore mentioned the operation of the distributing valve device in response to variations in pressure of fluid in the brake pipe 6 to control the brakes on the locomotive, and the control of the brakes on the locomotive by operation of the independent brake valve device 3 is the same as in the well-known No. 8EL locomotive brake equipment with but one exception which will now be described.

In the well-known SEL brake equipment the brake cylinder passage 39 is open past a check valve ltl to a passage 182 in turn open to the passage ill above the equalizing piston 54 and thereby to the independent application pipe 8. Thus when an automatic application of brakes on the locomotive is effective in response to a reduction in pressure in the brake pipe. 6 the independent application pipe 8 will become charged with fluid under pressure from the brake cylinder device 5. Then when the equalizing piston Ell operates the main equalizing slide valve 59 back to its r lease position for effecting a release of such an application, and in which position the application piston chamber t! will be connected by way of the reduction cut-cit" valve device ill to passage M and then through choke H to the independent application pipe 8, the pressure of fluid in the application piston chamber will not reduce by equalizing into said independent application pipe and thereby effect an undesired and uncontrolled degree of brake release.

If the dynamic brakes become effective at the time an automatic service application of the fluid pressure brakes were effective this communication past the check valve 58!, if open, would permit flow of fluid under pressure from the brake cylinder passage 39 to the independent application pipe 8 and thence to the lower end of the double check valve I22. Upon venting the upper end of the double check valve I22 past the open valve I26 in the magnet valve device l25 said double check valve would be shifted to its upper position by the fluid under pressure in the independent application pipe 8 and such fluid from the brake cylinder passage 39 would then flow to pipe Ill and thence to the application piston chamber 4I and maintain the pressure of fluid in the latter chamber and thereby hold the fluid pressure brakes on the locomotive applied while the dynamic brakes were effective. This is undesired and in order to prevent such occurring a plug I83 is provided to close communication between the passages I82 and Ill in the distributing valve device. This plug eliminates the charging of the independent application pipe 8 when an automatic application of the fluid pressure brakes is effective with the dynamic brake inefiective, as will be seen, but it is a necessary modification when adding dynamic brake control to a locomotive equipped with the No. SEL locomotive brake equipment.

n diesel locomotives of the multiple unit type the A or leading unit will be equipped with the fluid pressure brake equipment above described while a B or trailing unit will be similarly equipped except for the engineers automatic and independent brake valve devices 2 and 3 which will be provided only on the leading unit. The brake pipe 6 will extend through the trailing B unit of the locomotive for connection with the brake pipe on a train; the independent application pipe 8, the main reservoir pipe 'I and the independent release pipe 9 will all extend to the trailing unit for connection with the distributing valve device I thereon; and on certain locomotives the controlled emergency pipe I0 will also extend to the B unit of the locomotive for connection with the relay valve device I42 thereon. With such an arrangement the apparatus on the trailing unit will operate in synchronism with that of the leading unit in response to control from the brake valve devices 2 and 3, as will be apparent.

On certain multiple unit locomotives the controlled emergency pipe I0 does not however extend to the trailing locomotive unit or units and on such units it has been customary to interpose between the bracket of the distributing valve device I and the controlled emergency valve device 32 a filler piece I85 (Fig. and to plug the pipe connection of pipe I00 to the pipe bracket 30. The filler piece I85 has passageways extending between the pipe bracket 30 and the controlled emergency valve device 32 for providing normal operation of the brake equipment and also comprises a selector valve I86 for controlling communication between the main reservoir passage 5| and the controlled emergency piston chamber I03. The selector valve I86 has a long train position in which it is shown in the drawing for opening communication between B units of multiple unit locomotives not equipped with a controlled emergency pipe I0 and equipped with the filler piece I 85, I interpose the filling piece IIJI between the filler piece I and the controlled emergency valve device 32. I remove the plug I12 from the filling piece I0! and connect thereto a pipe I for connecting passage I 08 in said filling piece to valve chamber I40 in the relay valve device I 42. The removed plug II2 I place in the recess II 3 in the filling piece III! for closing communication between passage I08 in said filling piece and the passage I8l in the old filling piece I85. The pipe I00, connected to passage I37 in the old filling piece I85, I connect to valve chamber I50 in the relay valve device I42. With the selector valve I86 in the long train position in which it is shown in Fig. 5 fluid from the main reservoir pipe 5I will therefore be supplied through pipe I00 to chamber I50 in the relay valve device I42, so that upon operation of said relay valve device in response to an emergency reduction in pressure of fluid in the brake pipe 6, as before described, the fluid under pressure from the pipe I00 will be supplied through pipe I90 to piston chamber I03 of the controlled emergency valve device 32 for actuating same to its long train position to delay an emergency application of locomotive brakes when the locomotive is connected with a long train, in the same manner as hereinbefore described in connection with the structure shown in Fig. 1a. When the selector valve I86 in the filler piece I85 is in short train position venting the pipe I00 there will be no supply of fluid under pressure to piston chamber I03 in the controlled emergency valve device 32 whereby upon operation of the relay valve device I42 in response to an emergency reduction in brake pipe pressure the controlled emergency valve device 32 will remain in its short train position and the locomotive brakes will be applied in the same manner as with the structure shown in Fig. 1a.

It will therefore be seen that when the selector valve handle I74 on the A unit of the locomotive is moved to a certain position and the selector valve I86 on a B unit is correspondingly positioned the brakes on both units will operate in like manner in response to either a service or an emergency reduction in pressure in the brake pipe 6.

Summary From the above description it will now be seen that I have provided means for interlocking operation of the well-known 8EL locomotive brake equipment and the dynamic brakes of a locomotive, comprising one or more power units, in such a manner that with the dynamic brakes released the automatic fluid pressure brakes may operate in the usual manner and which, with the dynamic brakes applied, prevents an automatic application of the fluid pressure brakes on the locomotive or, if such an application is in eifect at the time the dynamic brakes are brought into operation such automatic application of the fluid pressure brakes will be released. In case of an emergency reduction in pressure of fluid in the brake pipe, the dynamic brakes, if efiective, will be cut out however when the fluid pressure brakes are brought into operat1on. With the dynamic brakes effective the fluid pressure brakes on the locomotive can be applied and released, if necessary however, by operation of the independent brake valve device of the 8EL brake equipment.

17 Having now described thev invention, what I claimv as new and. desire to secure by Letters Patent, is:

I. In a fluid pres-sure brake equipment, in com bination, a brake pipe, means operativein response to a reduction in pressure of fluid in said brake pi ac to supply fluid under pressure to effect an application of brakes, valve means for either restricting said supply or permitting a faster rate of said supply, means operative by pressure of fluid in said brake pipe for conditioning said valve means to provide said faster rate of supply, and means operative upon an emergency reduction in brake pipe pressure to condition said valve means to restrict said supply.

2. In a fluid pressure brake equipment, in combination, a brake pipe, means operative in response to a reduction in pressure of fluid in said brake pipe to supply fluid under pressure to effect an application of brakes, valve means responsive to pressure of fluid in a chamber to retard said supply of fluid under pressure and operative upon release of fluid under pressure from said chamber to provide for a faster rate of said supply, means operative by pressure. of fluid in said brake pipe for venting said cham ber, and means operative upon an emergency reduction in, brake pipe pressure to supply fluid under pressure to said chamber.

3. In a fluid pressure brake equipment, in com bination, a brake pipe, means operative in response to a reduction in pressure of. fluid in said brakev pipe to supply fluid under pressure to eilect an, application of brakes, valve means responsive to pressure of fluid in a chamber to retard said supply of fluid under pressure and operative upon release. of fluid under pressure. from said chamher to provide for a faster rate of said supply, a second pipe, means operative by pressure of fluid in said brake pipe for venting. said chamber, means operative upon. an emergency reduction in pressure of fluid in said brake pipe to open saidv chamber to said second pipe, and selector means for either supplying fluid under pressure to said second pipe or for clos;n;g of. such supply.

4. In a fluid pressure. brake equipment, in combination, a brake pi e, normally vented application and application piston chambers, means responsi ve to pressure of fluid in said piston chamher to effectsan application of brakes and responsive to release of fluid under pressure from said piston chamber to effect release: of brakes, a normally charged pressure chamber, a passageway, brake control means operable upon a, reduction in pressure of fluid in said brake pipe to open said pressure chamber to said passageway, valve means having one position for establishing a restricted communication between said passageway and said piston and application chambers and having a second position for establishing a communication of greater flow capacity than said restricted communication between said passageway and said piston chamber and for disconnecting said application chamber from said piston chamber, means operative by pressure of fluid in said brake pipe for positioning said valve means in its said second position, and means operative upon an emergency reduction in pressure in said brake pipe for effecting movement of said valve means to its said one position.

5. In a fluid pressure brake equipment, in combination, a brake pipe, normally vented application and application piston chambers, means responsive to pressure of fluid in said piston chamber to effect an application of brakes and responsivc to release: of fluid. under pressure from said piston chamber to effect a release. or brakes, a. normally charged pressure chamber, a passageway, brake control means operable upon. a reduction. in pressure of fluid in said brake pipe to open said pressure chamber tosaid passageway, valve means having one position for establishing a restricted communication between said passageway' and said piston and application. chambers and having a second position for establishing a communication of greater flow capacity than. said restricted communication between said passageway and said piston chamber and for disconnecting said application chamber from said piston chamber, operators selector means having two control positions, and means cooperative with said selector means for effecting movement of said valve means to its said one position in one but not the other of said control positions, in response to an emergency reduction in pressure of fluid in said brake pipe.

'6. In combination, a brake pipe, a normally charged pressure chamber, a normally vented application chamber, brake application means responsiveto pressure of fluid in a control chamber to effect an application of brakes, brake control means operative in response to a service reduction in pressure of fluid in said brake pipe to open said pressure chamber to said application chamber and to a passageway and operative in response to an emergency reduction in pressure in said brake pipe to open said pressure chamber only to said passageway, controlled emergency means having one position for establishing a restricted communication between said passage- Way and said control and application chambers and another position for opening a communication of greater flow capacity between said passageway and said control chamber only, means operative by pressure of fluid in said brake pipe for effecting movement of said controlled emergency" means to its other position, and means op erative upon an emergency reduction in brake pipe pressure for effecting movement of said emergency control means to its one position.

T. In a locomotive fluid pressure brake equip ment, in combination, a brake pipe, a distribut ing valve device comprising an application ortion operable by fluid under pressure in a control chamber to enact an, application of brakes. said distributing valve device further comprisin? a normally charged pressure chamber, 9, normally vented application chamber, a controlled emergency valve device and an equalizing portion operative in response to an emergency reduction in brake pipe pressure to open said pressure chamber to a passage, said controlled emergency valve device comprising means operative upon supply of fluid under pressure to another chamber to a position for establishing a restricted communication from said passage to said control and application chambers and operative upon venting of fluid under pressure from said other chamber to establish a communication of greater flow capacity between said passage and only said control chamber, a controlled emergency pipe, operator's selector means for selectively supplying fluid under pressure to or for venting said controlled emergency pip-e, means operative by pressure of fluid in said brake pipe for venting said other chamber, and means operative upon an emergency reduction in brake pipe pressure for opening said other chamber to said controlled emergency pipe.

8. A locomotive fluid pressure brake equipment comprising in combination, a brake pipe,"adis tributing valve device comprising a pipe bracket, a reservoir portion carried by said bracket having a normally charged pressure chamber and a normally vented application chamber, an application valve device carried by said bracket operative in response to supply of fluid under pressure to an application passage in said bracket to effect an application of brakes, and a equalizing portion carried by said bracket operative upon a service reduction in pressure of fluid in said brake pipe to open said pressure chamber to said application chamber and to a second passage in said bracket and operative upon an emergency reduction in pressure of fluid in said brake pipe to open said pressure chamber to said second passage but not to said application chamber, controlled emergency valve means carried by said bracket having one position for establishing a restricted communication from said second passage to both said application passage and said application chamher and having a second position for establishing a communication of greater flow capacity from said second passage only to said application passage, means operative by pressure of fluid in said brake pipe for efiecting movement of said controlled emergency means to its said second position, and means operative upon an emergency reduction in pressure of fluid in said brake pipe for effecting movement of said controlled emergency means to its said one position.

9. In a locomotive brake equipment, the combination with a brake pipe, of a distributing valve device comprising a pipe bracket, a reservoir mounted on said bracket having a normally 3 charged pressure chamber and a normally vented application chamber, an application valve device responsive to supply of fluid under pressure to a first passage in said bracket to effect an application of brakes, an equalizing valve device operative upon a service reduction in pressure in said brake pipe to open said pressure chamber to a second passage in said bracket open to said application chamber and also to a third passage in said bracket and operative upon an emergency reduction in brake pipe pressure to open said pressure chamber to said third passage but not to said second passage, a controlled emergency valve device, a filler piece carried by said pipe bracket carrying said contro1 emergency valve device and having passages opening said first and second passages in said bracket to said controlled emergency valve device, means connecting said third passage in said bracket to said controlled emergency valve device, said controlled emergency valve device including a piston subject to pressure of fluid in a control chamber, and means operative by said piston upon supply of fluid under pressure to said control chamber to establish a restricted communication from said third passage to said first and second passages and operative upon venting of said control chamber to open said first passage to said third passage but not to said second passage, a controlled emergency pipe, a selector valve device for either supplying fluid under pressure to or for venting said controlled emergency pipe, means operative by brake pipe pressure for venting said control chamber, and means operative upon an emergency reduction in brake pipe 4 pressure for opening said control chamber to said controlled emergency pipe.

10. In a locomotive brake equipment, in combination, a brake pipe, a distributing valve device comprising an application portion operative in response to supply of fluid under pressure to a chamber to effect an application of brakes, an equalizing portion operative upon a reduction in pressure of fluid in said brake pipe to supply fluid under pressure to said chamber, a bracket carrying said application and equalizing portions, a controlled emergency valve device operative upon supply of fluid under pressure to a chamber for restricting flow of fluid under pressure from said equalizing portion to the chamber of said application portion and upon venting of such chamber to provide for a more rapid rate of such flow, a first filler piece carrying said controlled emergency valve device, a second filler piece carried by said bracket carrying said first filler piece, said second filler piece comprising a selector valve for selectively supplying fluid under pressure to or venting fluid under pressure from a passage, and means controlled by brake pipe pressure for venting said chamber in said controlled emergency valve device except upon an emergency reduction in brake pipe pressure and for then connecting said passage to the last named chamber.

IRWIN M. EISENBERG.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,058,016 Hewitt Oct. 20, 1936 2,130,620 Hewitt Sept. 20, 1938 2,106,479 Fitch Jan. 25, 1938 2,276,812 Webb et a1 Mar. 17, 1942 2,445,680 Linhart July 20, 1948 

